Y(4140)
The Y(4140) particle is an electrically neutral exotic hadron candidate that is about 4.4 times heavier than the proton. It was observed at Fermilab and announced on 17 March 2009.[1] This particle is extremely rare and was detected in only 20 of billions of collisions.[2]
Since it decays into J/ψ and φ mesons, it has been suggested that this particle is composed of charm quarks and charm antiquarks, possibly even a four quark combination.[3] The existence of the particle has been confirmed by members of the CMS collaboration at the Large Hadron Collider on November 14, 2012[4][5] and by the DØ experiment at the Tevatron on September 25, 2013.[6][7] The Belle experiment[8] has searched for this particle but found no evidence for its existence. The LHCb experiment observes a peak at the same position in the J/ψϕ invariant mass, but it is best described as a Ds±Ds∗∓ cusp, and is much broader than the previous measurements of the Y(4140). [9][10]
The Particle Data Group has renamed Y(4140) to follow naming conventions to X(4140).
See also
External links
- Press release kit for the Y(4140). Contains images of decay modes and resonance data.
References
- ↑ "Oddball Particle Surprises Physicists at Fermilab". redOrbit. 19 March 2009. Retrieved 2009-03-21.
- ↑ Handwerk, Brian (20 March 2009). "Strange Particle Created; May Rewrite How Matter's Made". National Geographic News. Retrieved 2009-03-21.
- ↑ Minard, Anne (18 March 2009). "New Particle Throws Monkeywrench in Particle Physics". Universe Today.
- ↑ Riesselmann, Kurt (December 4, 2012). "Experiment confirms existence of odd particle". Phys.Org.
- ↑ Hidalgo-Duquea, C., Nievesa, J., Pavón Valderrama, M. (November 29, 2012). "Heavy Quark Spin Symmetry and SU(3)-Flavour Partners of the X(3872)".
- ↑ Dorigo, Tommaso (September 26, 2013). "DZERO Confirms The Y(4140) And Its Excitation"
- ↑ D0 Collaboration (September 25, 2013). "Search for the X(4140) state in B+->J/psi phi K+ decays with the D0 detector"
- ↑ Shen, C. P.; et al. (2010). "Evidence for a New Resonance and Search for the Y(4140) in the γγ→ϕJ/ψ Process". Physical Review Letters. 104: 112004. arXiv:0912.2383
. Bibcode:2010PhRvL.104k2004S. doi:10.1103/PhysRevLett.104.112004. - ↑ http://arxiv.org/abs/1606.07895
- ↑ http://arxiv.org/abs/1606.07898
Further reading
- Aaltonen, T.; et al. (2009). "Evidence for a Narrow Near-Threshold Structure in the J/ψφ Mass Spectrum B+ → J/ψφK+ Decays". Physical Review Letters. 102: 242002. arXiv:0903.2229. Bibcode:2009PhRvL.102x2002A. doi:10.1103/PhysRevLett.102.242002.
- Xiang, Liu; Zhu, Shi-Lin (2009). "Y(4143) is probably a molecular partner of Y(3930)". Physical Review D. 80: 017502. arXiv:0903.2529. Bibcode:2009PhRvD..80a7502L. doi:10.1103/PhysRevD.80.017502.
- Mahajan, Namit (2009). "Y(4140): Possible options". Physics Letters B. 679 (3): 228–230. arXiv:0903.3107. Bibcode:2009PhLB..679..228M. doi:10.1016/j.physletb.2009.07.043.